Metal frames are often made of a certain metal material or alloy. Most of them are made of copper alloy, which is then surface treated and plated with gold, tantalum, palladium or titanium. Due to the different plating processes, some frames are easy to fade, and some are not easy to fade.
The metal frame is sturdy, lightweight, beautiful, and has a wide variety of styles. The metal frames are basically provided with nose pads, and the nose pads are movable to use various nose shapes. Most of the temples are hockey sticks or curved, and the ends are often covered with plastic sleeves, which are not only beautiful, but also protect the temples and skin.
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